 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.views.markers.internal;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.ui.views.tasklist.ITaskListResourceAdapter;

 /**
  * The DefaultMarkerResourceAdapter is the default
  * implementation of the IMarkerResourceAdapter used by the
  * MarkerView for resource adaption.
  */
 class DefaultMarkerResourceAdapter implements ITaskListResourceAdapter {

     private static ITaskListResourceAdapter singleton;

     /**
      * Constructor for DefaultMarkerResourceAdapter.
      */
     DefaultMarkerResourceAdapter() {
         super();
     }

     /**
      * Return the default instance used for MarkerView adapting.
      */
     static ITaskListResourceAdapter getDefault() {
         if (singleton == null) {
             singleton = new DefaultMarkerResourceAdapter();
         }
         return singleton;
     }

     /**
      * @see IMarkerResourceAdapter#getAffectedResource(IAdaptable)
      */
     public IResource getAffectedResource(IAdaptable adaptable) {
         IResource resource = (IResource) adaptable.getAdapter(IResource.class);

         if (resource == null) {
             return (IFile) adaptable.getAdapter(IFile.class);
         } else {
             return resource;
         }
     }
 }

